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'use strict'let { existsSync, readFileSync } = require('fs')let { dirname, join } = require('path')let mozilla = require('source-map')function fromBase64(str) { if (Buffer) { return Buffer.from(str, 'base64').toString() } else { // istanbul ignore next return window.atob(str) }}class PreviousMap { constructor(css, opts) { if (opts.map === false) return this.loadAnnotation(css) this.inline = this.startWith(this.annotation, 'data:') let prev = opts.map ? opts.map.prev : undefined let text = this.loadMap(opts.from, prev) if (!this.mapFile && opts.from) { this.mapFile = opts.from } if (this.mapFile) this.root = dirname(this.mapFile) if (text) this.text = text } consumer() { if (!this.consumerCache) { this.consumerCache = new mozilla.SourceMapConsumer(this.text) } return this.consumerCache } withContent() { return !!( this.consumer().sourcesContent && this.consumer().sourcesContent.length > 0 ) } startWith(string, start) { if (!string) return false return string.substr(0, start.length) === start } getAnnotationURL(sourceMapString) { return sourceMapString .match(/\/\*\s*# sourceMappingURL=(.*)\s*\*\//)[1] .trim() } loadAnnotation(css) { // BUG: NVD-CWE-noinfo Insufficient Information // let annotations = css.match(/\/\*\s*# sourceMappingURL=.*\s*\*\//gm) // FIXED: let annotations = css.match(/\/\*\s*# sourceMappingURL=.*\*\//gm) if (annotations && annotations.length > 0) { // Locate the last sourceMappingURL to avoid picking up // sourceMappingURLs from comments, strings, etc. let lastAnnotation = annotations[annotations.length - 1] if (lastAnnotation) { this.annotation = this.getAnnotationURL(lastAnnotation) } } } decodeInline(text) { let baseCharsetUri = /^data:application\/json;charset=utf-?8;base64,/ let baseUri = /^data:application\/json;base64,/ let charsetUri = /^data:application\/json;charset=utf-?8,/ let uri = /^data:application\/json,/ if (charsetUri.test(text) || uri.test(text)) { return decodeURIComponent(text.substr(RegExp.lastMatch.length)) } if (baseCharsetUri.test(text) || baseUri.test(text)) { return fromBase64(text.substr(RegExp.lastMatch.length)) } let encoding = text.match(/data:application\/json;([^,]+),/)[1] throw new Error('Unsupported source map encoding ' + encoding) } loadFile(path) { this.root = dirname(path) if (existsSync(path)) { this.mapFile = path return readFileSync(path, 'utf-8').toString().trim() } } loadMap(file, prev) { if (prev === false) return false if (prev) { if (typeof prev === 'string') { return prev } else if (typeof prev === 'function') { let prevPath = prev(file) if (prevPath) { let map = this.loadFile(prevPath) if (!map) { throw new Error( 'Unable to load previous source map: ' + prevPath.toString() ) } return map } } else if (prev instanceof mozilla.SourceMapConsumer) { return mozilla.SourceMapGenerator.fromSourceMap(prev).toString() } else if (prev instanceof mozilla.SourceMapGenerator) { return prev.toString() } else if (this.isMap(prev)) { return JSON.stringify(prev) } else { throw new Error( 'Unsupported previous source map format: ' + prev.toString() ) } } else if (this.inline) { return this.decodeInline(this.annotation) } else if (this.annotation) { let map = this.annotation if (file) map = join(dirname(file), map) return this.loadFile(map) } } isMap(map) { if (typeof map !== 'object') return false return ( typeof map.mappings === 'string' || typeof map._mappings === 'string' || Array.isArray(map.sections) ) }}module.exports = PreviousMapPreviousMap.default = PreviousMap |